Commit | Line | Data |
---|---|---|
17926a79 DH |
1 | /* AF_RXRPC implementation |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 | 14 | #include <linux/module.h> |
ce6654cf | 15 | #include <linux/kernel.h> |
17926a79 | 16 | #include <linux/net.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
17926a79 DH |
18 | #include <linux/skbuff.h> |
19 | #include <linux/poll.h> | |
20 | #include <linux/proc_fs.h> | |
76181c13 | 21 | #include <linux/key-type.h> |
457c4cbc | 22 | #include <net/net_namespace.h> |
17926a79 DH |
23 | #include <net/sock.h> |
24 | #include <net/af_rxrpc.h> | |
25 | #include "ar-internal.h" | |
26 | ||
27 | MODULE_DESCRIPTION("RxRPC network protocol"); | |
28 | MODULE_AUTHOR("Red Hat, Inc."); | |
29 | MODULE_LICENSE("GPL"); | |
30 | MODULE_ALIAS_NETPROTO(PF_RXRPC); | |
31 | ||
95c96174 | 32 | unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; |
17926a79 | 33 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); |
424b00e2 | 34 | MODULE_PARM_DESC(debug, "RxRPC debugging mask"); |
17926a79 | 35 | |
17926a79 DH |
36 | static struct proto rxrpc_proto; |
37 | static const struct proto_ops rxrpc_rpc_ops; | |
38 | ||
39 | /* local epoch for detecting local-end reset */ | |
0d12f8a4 | 40 | u32 rxrpc_epoch; |
17926a79 DH |
41 | |
42 | /* current debugging ID */ | |
43 | atomic_t rxrpc_debug_id; | |
44 | ||
45 | /* count of skbs currently in use */ | |
46 | atomic_t rxrpc_n_skbs; | |
47 | ||
651350d1 DH |
48 | struct workqueue_struct *rxrpc_workqueue; |
49 | ||
17926a79 DH |
50 | static void rxrpc_sock_destructor(struct sock *); |
51 | ||
52 | /* | |
53 | * see if an RxRPC socket is currently writable | |
54 | */ | |
55 | static inline int rxrpc_writable(struct sock *sk) | |
56 | { | |
57 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
58 | } | |
59 | ||
60 | /* | |
61 | * wait for write bufferage to become available | |
62 | */ | |
63 | static void rxrpc_write_space(struct sock *sk) | |
64 | { | |
65 | _enter("%p", sk); | |
43815482 | 66 | rcu_read_lock(); |
17926a79 | 67 | if (rxrpc_writable(sk)) { |
43815482 ED |
68 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
69 | ||
1ce0bf50 | 70 | if (skwq_has_sleeper(wq)) |
43815482 | 71 | wake_up_interruptible(&wq->wait); |
8d8ad9d7 | 72 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 | 73 | } |
43815482 | 74 | rcu_read_unlock(); |
17926a79 DH |
75 | } |
76 | ||
77 | /* | |
78 | * validate an RxRPC address | |
79 | */ | |
80 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
81 | struct sockaddr_rxrpc *srx, | |
82 | int len) | |
83 | { | |
dad8aff7 | 84 | unsigned int tail; |
ab802ee0 | 85 | |
17926a79 DH |
86 | if (len < sizeof(struct sockaddr_rxrpc)) |
87 | return -EINVAL; | |
88 | ||
89 | if (srx->srx_family != AF_RXRPC) | |
90 | return -EAFNOSUPPORT; | |
91 | ||
92 | if (srx->transport_type != SOCK_DGRAM) | |
93 | return -ESOCKTNOSUPPORT; | |
94 | ||
95 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
96 | if (srx->transport_len < sizeof(sa_family_t) || | |
97 | srx->transport_len > len) | |
98 | return -EINVAL; | |
99 | ||
19ffa01c | 100 | if (srx->transport.family != rx->family) |
17926a79 DH |
101 | return -EAFNOSUPPORT; |
102 | ||
103 | switch (srx->transport.family) { | |
104 | case AF_INET: | |
4f95dd78 DH |
105 | if (srx->transport_len < sizeof(struct sockaddr_in)) |
106 | return -EINVAL; | |
21454aaa | 107 | _debug("INET: %x @ %pI4", |
17926a79 | 108 | ntohs(srx->transport.sin.sin_port), |
21454aaa | 109 | &srx->transport.sin.sin_addr); |
ab802ee0 | 110 | tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); |
17926a79 DH |
111 | break; |
112 | ||
113 | case AF_INET6: | |
114 | default: | |
115 | return -EAFNOSUPPORT; | |
116 | } | |
117 | ||
ab802ee0 DH |
118 | if (tail < len) |
119 | memset((void *)srx + tail, 0, len - tail); | |
17926a79 DH |
120 | return 0; |
121 | } | |
122 | ||
123 | /* | |
124 | * bind a local address to an RxRPC socket | |
125 | */ | |
126 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
127 | { | |
b4f1342f | 128 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; |
17926a79 DH |
129 | struct sock *sk = sock->sk; |
130 | struct rxrpc_local *local; | |
131 | struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; | |
17926a79 DH |
132 | int ret; |
133 | ||
134 | _enter("%p,%p,%d", rx, saddr, len); | |
135 | ||
136 | ret = rxrpc_validate_address(rx, srx, len); | |
137 | if (ret < 0) | |
138 | goto error; | |
139 | ||
140 | lock_sock(&rx->sk); | |
141 | ||
2341e077 | 142 | if (rx->sk.sk_state != RXRPC_UNBOUND) { |
17926a79 DH |
143 | ret = -EINVAL; |
144 | goto error_unlock; | |
145 | } | |
146 | ||
147 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
148 | ||
17926a79 DH |
149 | local = rxrpc_lookup_local(&rx->srx); |
150 | if (IS_ERR(local)) { | |
151 | ret = PTR_ERR(local); | |
152 | goto error_unlock; | |
153 | } | |
154 | ||
2341e077 | 155 | if (rx->srx.srx_service) { |
17926a79 DH |
156 | write_lock_bh(&local->services_lock); |
157 | list_for_each_entry(prx, &local->services, listen_link) { | |
2341e077 | 158 | if (prx->srx.srx_service == rx->srx.srx_service) |
17926a79 DH |
159 | goto service_in_use; |
160 | } | |
161 | ||
2341e077 | 162 | rx->local = local; |
17926a79 DH |
163 | list_add_tail(&rx->listen_link, &local->services); |
164 | write_unlock_bh(&local->services_lock); | |
165 | ||
166 | rx->sk.sk_state = RXRPC_SERVER_BOUND; | |
167 | } else { | |
2341e077 | 168 | rx->local = local; |
17926a79 DH |
169 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; |
170 | } | |
171 | ||
172 | release_sock(&rx->sk); | |
173 | _leave(" = 0"); | |
174 | return 0; | |
175 | ||
176 | service_in_use: | |
17926a79 | 177 | write_unlock_bh(&local->services_lock); |
2341e077 DH |
178 | rxrpc_put_local(local); |
179 | ret = -EADDRINUSE; | |
17926a79 DH |
180 | error_unlock: |
181 | release_sock(&rx->sk); | |
182 | error: | |
183 | _leave(" = %d", ret); | |
184 | return ret; | |
185 | } | |
186 | ||
187 | /* | |
188 | * set the number of pending calls permitted on a listening socket | |
189 | */ | |
190 | static int rxrpc_listen(struct socket *sock, int backlog) | |
191 | { | |
192 | struct sock *sk = sock->sk; | |
193 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
0e119b41 | 194 | unsigned int max; |
17926a79 DH |
195 | int ret; |
196 | ||
197 | _enter("%p,%d", rx, backlog); | |
198 | ||
199 | lock_sock(&rx->sk); | |
200 | ||
201 | switch (rx->sk.sk_state) { | |
2341e077 | 202 | case RXRPC_UNBOUND: |
17926a79 DH |
203 | ret = -EADDRNOTAVAIL; |
204 | break; | |
17926a79 DH |
205 | case RXRPC_SERVER_BOUND: |
206 | ASSERT(rx->local != NULL); | |
0e119b41 DH |
207 | max = READ_ONCE(rxrpc_max_backlog); |
208 | ret = -EINVAL; | |
209 | if (backlog == INT_MAX) | |
210 | backlog = max; | |
211 | else if (backlog < 0 || backlog > max) | |
212 | break; | |
17926a79 DH |
213 | sk->sk_max_ack_backlog = backlog; |
214 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
215 | ret = 0; | |
216 | break; | |
0e119b41 DH |
217 | default: |
218 | ret = -EBUSY; | |
219 | break; | |
17926a79 DH |
220 | } |
221 | ||
222 | release_sock(&rx->sk); | |
223 | _leave(" = %d", ret); | |
224 | return ret; | |
225 | } | |
226 | ||
227 | /* | |
228 | * find a transport by address | |
229 | */ | |
19ffa01c DH |
230 | struct rxrpc_transport * |
231 | rxrpc_name_to_transport(struct rxrpc_conn_parameters *cp, | |
232 | struct sockaddr *addr, | |
233 | int addr_len, | |
234 | gfp_t gfp) | |
17926a79 DH |
235 | { |
236 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
237 | struct rxrpc_transport *trans; | |
17926a79 | 238 | |
19ffa01c | 239 | _enter("%p,%d", addr, addr_len); |
17926a79 | 240 | |
19ffa01c | 241 | if (cp->local->srx.transport_type != srx->transport_type) |
17926a79 | 242 | return ERR_PTR(-ESOCKTNOSUPPORT); |
19ffa01c | 243 | if (cp->local->srx.transport.family != srx->transport.family) |
17926a79 DH |
244 | return ERR_PTR(-EAFNOSUPPORT); |
245 | ||
246 | /* find a remote transport endpoint from the local one */ | |
19ffa01c DH |
247 | cp->peer = rxrpc_lookup_peer(cp->local, srx, gfp); |
248 | if (!cp->peer) | |
0e4699e4 | 249 | return ERR_PTR(-ENOMEM); |
17926a79 DH |
250 | |
251 | /* find a transport */ | |
19ffa01c DH |
252 | trans = rxrpc_get_transport(cp->local, cp->peer, gfp); |
253 | rxrpc_put_peer(cp->peer); | |
17926a79 DH |
254 | _leave(" = %p", trans); |
255 | return trans; | |
256 | } | |
257 | ||
651350d1 DH |
258 | /** |
259 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
260 | * @sock: The socket on which to make the call | |
2341e077 | 261 | * @srx: The address of the peer to contact |
651350d1 DH |
262 | * @key: The security context to use (defaults to socket setting) |
263 | * @user_call_ID: The ID to use | |
264 | * | |
265 | * Allow a kernel service to begin a call on the nominated socket. This just | |
266 | * sets up all the internal tracking structures and allocates connection and | |
267 | * call IDs as appropriate. The call to be used is returned. | |
268 | * | |
269 | * The default socket destination address and security may be overridden by | |
270 | * supplying @srx and @key. | |
271 | */ | |
272 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
273 | struct sockaddr_rxrpc *srx, | |
274 | struct key *key, | |
275 | unsigned long user_call_ID, | |
276 | gfp_t gfp) | |
277 | { | |
19ffa01c | 278 | struct rxrpc_conn_parameters cp; |
651350d1 DH |
279 | struct rxrpc_transport *trans; |
280 | struct rxrpc_call *call; | |
281 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
f4552c2d | 282 | int ret; |
651350d1 DH |
283 | |
284 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
285 | ||
f4552c2d DH |
286 | ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); |
287 | if (ret < 0) | |
288 | return ERR_PTR(ret); | |
289 | ||
651350d1 DH |
290 | lock_sock(&rx->sk); |
291 | ||
19ffa01c DH |
292 | if (!key) |
293 | key = rx->key; | |
294 | if (key && !key->payload.data[0]) | |
295 | key = NULL; /* a no-security key */ | |
296 | ||
297 | memset(&cp, 0, sizeof(cp)); | |
298 | cp.local = rx->local; | |
299 | cp.key = key; | |
300 | cp.security_level = 0; | |
301 | cp.exclusive = false; | |
302 | cp.service_id = srx->srx_service; | |
303 | ||
304 | trans = rxrpc_name_to_transport(&cp, (struct sockaddr *)srx, | |
305 | sizeof(*srx), gfp); | |
2341e077 DH |
306 | if (IS_ERR(trans)) { |
307 | call = ERR_CAST(trans); | |
308 | trans = NULL; | |
309 | goto out_notrans; | |
651350d1 | 310 | } |
19ffa01c | 311 | cp.peer = trans->peer; |
651350d1 | 312 | |
999b69f8 | 313 | call = rxrpc_new_client_call(rx, &cp, trans, srx, user_call_ID, gfp); |
651350d1 | 314 | rxrpc_put_transport(trans); |
15bde727 | 315 | out_notrans: |
651350d1 DH |
316 | release_sock(&rx->sk); |
317 | _leave(" = %p", call); | |
318 | return call; | |
319 | } | |
651350d1 DH |
320 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
321 | ||
322 | /** | |
323 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
324 | * @call: The call to end | |
325 | * | |
326 | * Allow a kernel service to end a call it was using. The call must be | |
327 | * complete before this is called (the call should be aborted if necessary). | |
328 | */ | |
329 | void rxrpc_kernel_end_call(struct rxrpc_call *call) | |
330 | { | |
331 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
332 | rxrpc_remove_user_ID(call->socket, call); | |
333 | rxrpc_put_call(call); | |
334 | } | |
651350d1 DH |
335 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
336 | ||
337 | /** | |
338 | * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages | |
339 | * @sock: The socket to intercept received messages on | |
340 | * @interceptor: The function to pass the messages to | |
341 | * | |
342 | * Allow a kernel service to intercept messages heading for the Rx queue on an | |
343 | * RxRPC socket. They get passed to the specified function instead. | |
344 | * @interceptor should free the socket buffers it is given. @interceptor is | |
345 | * called with the socket receive queue spinlock held and softirqs disabled - | |
346 | * this ensures that the messages will be delivered in the right order. | |
347 | */ | |
348 | void rxrpc_kernel_intercept_rx_messages(struct socket *sock, | |
349 | rxrpc_interceptor_t interceptor) | |
350 | { | |
351 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
352 | ||
353 | _enter(""); | |
354 | rx->interceptor = interceptor; | |
355 | } | |
356 | ||
357 | EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); | |
358 | ||
17926a79 DH |
359 | /* |
360 | * connect an RxRPC socket | |
361 | * - this just targets it at a specific destination; no actual connection | |
362 | * negotiation takes place | |
363 | */ | |
364 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
365 | int addr_len, int flags) | |
366 | { | |
2341e077 DH |
367 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
368 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
369 | int ret; |
370 | ||
371 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
372 | ||
373 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
374 | if (ret < 0) { | |
375 | _leave(" = %d [bad addr]", ret); | |
376 | return ret; | |
377 | } | |
378 | ||
379 | lock_sock(&rx->sk); | |
380 | ||
2341e077 DH |
381 | ret = -EISCONN; |
382 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
383 | goto error; | |
384 | ||
17926a79 | 385 | switch (rx->sk.sk_state) { |
2341e077 DH |
386 | case RXRPC_UNBOUND: |
387 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
388 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
389 | case RXRPC_CLIENT_BOUND: |
390 | break; | |
17926a79 | 391 | default: |
2341e077 DH |
392 | ret = -EBUSY; |
393 | goto error; | |
17926a79 DH |
394 | } |
395 | ||
2341e077 DH |
396 | rx->connect_srx = *srx; |
397 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
398 | ret = 0; | |
17926a79 | 399 | |
2341e077 | 400 | error: |
17926a79 | 401 | release_sock(&rx->sk); |
2341e077 | 402 | return ret; |
17926a79 DH |
403 | } |
404 | ||
405 | /* | |
406 | * send a message through an RxRPC socket | |
407 | * - in a client this does a number of things: | |
408 | * - finds/sets up a connection for the security specified (if any) | |
409 | * - initiates a call (ID in control data) | |
410 | * - ends the request phase of a call (if MSG_MORE is not set) | |
411 | * - sends a call data packet | |
412 | * - may send an abort (abort code in control data) | |
413 | */ | |
1b784140 | 414 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 415 | { |
2341e077 | 416 | struct rxrpc_local *local; |
17926a79 DH |
417 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
418 | int ret; | |
419 | ||
420 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
421 | ||
422 | if (m->msg_flags & MSG_OOB) | |
423 | return -EOPNOTSUPP; | |
424 | ||
425 | if (m->msg_name) { | |
426 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
427 | if (ret < 0) { | |
428 | _leave(" = %d [bad addr]", ret); | |
429 | return ret; | |
430 | } | |
431 | } | |
432 | ||
17926a79 DH |
433 | lock_sock(&rx->sk); |
434 | ||
17926a79 | 435 | switch (rx->sk.sk_state) { |
2341e077 DH |
436 | case RXRPC_UNBOUND: |
437 | local = rxrpc_lookup_local(&rx->srx); | |
438 | if (IS_ERR(local)) { | |
439 | ret = PTR_ERR(local); | |
440 | goto error_unlock; | |
17926a79 | 441 | } |
2341e077 DH |
442 | |
443 | rx->local = local; | |
444 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
445 | /* Fall through */ | |
446 | ||
447 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 448 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
449 | if (!m->msg_name && |
450 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
451 | m->msg_name = &rx->connect_srx; | |
452 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 453 | } |
2341e077 DH |
454 | case RXRPC_SERVER_BOUND: |
455 | case RXRPC_SERVER_LISTENING: | |
456 | ret = rxrpc_do_sendmsg(rx, m, len); | |
17926a79 DH |
457 | break; |
458 | default: | |
2341e077 | 459 | ret = -EINVAL; |
17926a79 DH |
460 | break; |
461 | } | |
462 | ||
2341e077 | 463 | error_unlock: |
17926a79 | 464 | release_sock(&rx->sk); |
17926a79 DH |
465 | _leave(" = %d", ret); |
466 | return ret; | |
467 | } | |
468 | ||
469 | /* | |
470 | * set RxRPC socket options | |
471 | */ | |
472 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 473 | char __user *optval, unsigned int optlen) |
17926a79 DH |
474 | { |
475 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 476 | unsigned int min_sec_level; |
17926a79 DH |
477 | int ret; |
478 | ||
479 | _enter(",%d,%d,,%d", level, optname, optlen); | |
480 | ||
481 | lock_sock(&rx->sk); | |
482 | ret = -EOPNOTSUPP; | |
483 | ||
484 | if (level == SOL_RXRPC) { | |
485 | switch (optname) { | |
486 | case RXRPC_EXCLUSIVE_CONNECTION: | |
487 | ret = -EINVAL; | |
488 | if (optlen != 0) | |
489 | goto error; | |
490 | ret = -EISCONN; | |
2341e077 | 491 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 | 492 | goto error; |
cc8feb8e | 493 | rx->exclusive = true; |
17926a79 DH |
494 | goto success; |
495 | ||
496 | case RXRPC_SECURITY_KEY: | |
497 | ret = -EINVAL; | |
498 | if (rx->key) | |
499 | goto error; | |
500 | ret = -EISCONN; | |
2341e077 | 501 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
502 | goto error; |
503 | ret = rxrpc_request_key(rx, optval, optlen); | |
504 | goto error; | |
505 | ||
506 | case RXRPC_SECURITY_KEYRING: | |
507 | ret = -EINVAL; | |
508 | if (rx->key) | |
509 | goto error; | |
510 | ret = -EISCONN; | |
2341e077 | 511 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
512 | goto error; |
513 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
514 | goto error; | |
515 | ||
516 | case RXRPC_MIN_SECURITY_LEVEL: | |
517 | ret = -EINVAL; | |
95c96174 | 518 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
519 | goto error; |
520 | ret = -EISCONN; | |
2341e077 | 521 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
522 | goto error; |
523 | ret = get_user(min_sec_level, | |
95c96174 | 524 | (unsigned int __user *) optval); |
17926a79 DH |
525 | if (ret < 0) |
526 | goto error; | |
527 | ret = -EINVAL; | |
528 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
529 | goto error; | |
530 | rx->min_sec_level = min_sec_level; | |
531 | goto success; | |
532 | ||
533 | default: | |
534 | break; | |
535 | } | |
536 | } | |
537 | ||
538 | success: | |
539 | ret = 0; | |
540 | error: | |
541 | release_sock(&rx->sk); | |
542 | return ret; | |
543 | } | |
544 | ||
545 | /* | |
546 | * permit an RxRPC socket to be polled | |
547 | */ | |
548 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
549 | poll_table *wait) | |
550 | { | |
551 | unsigned int mask; | |
552 | struct sock *sk = sock->sk; | |
553 | ||
aa395145 | 554 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
555 | mask = 0; |
556 | ||
557 | /* the socket is readable if there are any messages waiting on the Rx | |
558 | * queue */ | |
559 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
560 | mask |= POLLIN | POLLRDNORM; | |
561 | ||
562 | /* the socket is writable if there is space to add new data to the | |
563 | * socket; there is no guarantee that any particular call in progress | |
564 | * on the socket may have space in the Tx ACK window */ | |
565 | if (rxrpc_writable(sk)) | |
566 | mask |= POLLOUT | POLLWRNORM; | |
567 | ||
568 | return mask; | |
569 | } | |
570 | ||
571 | /* | |
572 | * create an RxRPC socket | |
573 | */ | |
3f378b68 EP |
574 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
575 | int kern) | |
17926a79 DH |
576 | { |
577 | struct rxrpc_sock *rx; | |
578 | struct sock *sk; | |
579 | ||
580 | _enter("%p,%d", sock, protocol); | |
581 | ||
09ad9bc7 | 582 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
583 | return -EAFNOSUPPORT; |
584 | ||
b4f1342f | 585 | /* we support transport protocol UDP/UDP6 only */ |
17926a79 DH |
586 | if (protocol != PF_INET) |
587 | return -EPROTONOSUPPORT; | |
588 | ||
589 | if (sock->type != SOCK_DGRAM) | |
590 | return -ESOCKTNOSUPPORT; | |
591 | ||
592 | sock->ops = &rxrpc_rpc_ops; | |
593 | sock->state = SS_UNCONNECTED; | |
594 | ||
11aa9c28 | 595 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
596 | if (!sk) |
597 | return -ENOMEM; | |
598 | ||
599 | sock_init_data(sock, sk); | |
2341e077 | 600 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 | 601 | sk->sk_write_space = rxrpc_write_space; |
0e119b41 | 602 | sk->sk_max_ack_backlog = 0; |
17926a79 DH |
603 | sk->sk_destruct = rxrpc_sock_destructor; |
604 | ||
605 | rx = rxrpc_sk(sk); | |
19ffa01c | 606 | rx->family = protocol; |
17926a79 DH |
607 | rx->calls = RB_ROOT; |
608 | ||
609 | INIT_LIST_HEAD(&rx->listen_link); | |
610 | INIT_LIST_HEAD(&rx->secureq); | |
611 | INIT_LIST_HEAD(&rx->acceptq); | |
612 | rwlock_init(&rx->call_lock); | |
613 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
614 | ||
615 | _leave(" = 0 [%p]", rx); | |
616 | return 0; | |
617 | } | |
618 | ||
619 | /* | |
620 | * RxRPC socket destructor | |
621 | */ | |
622 | static void rxrpc_sock_destructor(struct sock *sk) | |
623 | { | |
624 | _enter("%p", sk); | |
625 | ||
626 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
627 | ||
547b792c IJ |
628 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
629 | WARN_ON(!sk_unhashed(sk)); | |
630 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
631 | |
632 | if (!sock_flag(sk, SOCK_DEAD)) { | |
633 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
634 | return; | |
635 | } | |
636 | } | |
637 | ||
638 | /* | |
639 | * release an RxRPC socket | |
640 | */ | |
641 | static int rxrpc_release_sock(struct sock *sk) | |
642 | { | |
643 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
644 | ||
645 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
646 | ||
647 | /* declare the socket closed for business */ | |
648 | sock_orphan(sk); | |
649 | sk->sk_shutdown = SHUTDOWN_MASK; | |
650 | ||
651 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
652 | sk->sk_state = RXRPC_CLOSE; | |
653 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
654 | ||
655 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
656 | ||
657 | if (!list_empty(&rx->listen_link)) { | |
658 | write_lock_bh(&rx->local->services_lock); | |
659 | list_del(&rx->listen_link); | |
660 | write_unlock_bh(&rx->local->services_lock); | |
661 | } | |
662 | ||
663 | /* try to flush out this socket */ | |
664 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 665 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
666 | rxrpc_purge_queue(&sk->sk_receive_queue); |
667 | ||
5627cc8b DH |
668 | rxrpc_put_local(rx->local); |
669 | rx->local = NULL; | |
17926a79 DH |
670 | key_put(rx->key); |
671 | rx->key = NULL; | |
672 | key_put(rx->securities); | |
673 | rx->securities = NULL; | |
674 | sock_put(sk); | |
675 | ||
676 | _leave(" = 0"); | |
677 | return 0; | |
678 | } | |
679 | ||
680 | /* | |
681 | * release an RxRPC BSD socket on close() or equivalent | |
682 | */ | |
683 | static int rxrpc_release(struct socket *sock) | |
684 | { | |
685 | struct sock *sk = sock->sk; | |
686 | ||
687 | _enter("%p{%p}", sock, sk); | |
688 | ||
689 | if (!sk) | |
690 | return 0; | |
691 | ||
692 | sock->sk = NULL; | |
693 | ||
694 | return rxrpc_release_sock(sk); | |
695 | } | |
696 | ||
697 | /* | |
698 | * RxRPC network protocol | |
699 | */ | |
700 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 701 | .family = PF_RXRPC, |
17926a79 DH |
702 | .owner = THIS_MODULE, |
703 | .release = rxrpc_release, | |
704 | .bind = rxrpc_bind, | |
705 | .connect = rxrpc_connect, | |
706 | .socketpair = sock_no_socketpair, | |
707 | .accept = sock_no_accept, | |
708 | .getname = sock_no_getname, | |
709 | .poll = rxrpc_poll, | |
710 | .ioctl = sock_no_ioctl, | |
711 | .listen = rxrpc_listen, | |
712 | .shutdown = sock_no_shutdown, | |
713 | .setsockopt = rxrpc_setsockopt, | |
714 | .getsockopt = sock_no_getsockopt, | |
715 | .sendmsg = rxrpc_sendmsg, | |
716 | .recvmsg = rxrpc_recvmsg, | |
717 | .mmap = sock_no_mmap, | |
718 | .sendpage = sock_no_sendpage, | |
719 | }; | |
720 | ||
721 | static struct proto rxrpc_proto = { | |
722 | .name = "RXRPC", | |
723 | .owner = THIS_MODULE, | |
724 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 725 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
726 | }; |
727 | ||
ec1b4cf7 | 728 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
729 | .family = PF_RXRPC, |
730 | .create = rxrpc_create, | |
731 | .owner = THIS_MODULE, | |
732 | }; | |
733 | ||
734 | /* | |
735 | * initialise and register the RxRPC protocol | |
736 | */ | |
737 | static int __init af_rxrpc_init(void) | |
738 | { | |
17926a79 DH |
739 | int ret = -1; |
740 | ||
ce6654cf | 741 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 742 | |
0d12f8a4 | 743 | rxrpc_epoch = get_seconds(); |
17926a79 | 744 | |
651350d1 | 745 | ret = -ENOMEM; |
17926a79 DH |
746 | rxrpc_call_jar = kmem_cache_create( |
747 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 748 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 749 | if (!rxrpc_call_jar) { |
9b6d5398 | 750 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
751 | goto error_call_jar; |
752 | } | |
753 | ||
e1fcc7e2 | 754 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 755 | if (!rxrpc_workqueue) { |
9b6d5398 | 756 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
757 | goto error_work_queue; |
758 | } | |
759 | ||
648af7fc DH |
760 | ret = rxrpc_init_security(); |
761 | if (ret < 0) { | |
9b6d5398 | 762 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
763 | goto error_security; |
764 | } | |
765 | ||
17926a79 | 766 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 767 | if (ret < 0) { |
9b6d5398 | 768 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
769 | goto error_proto; |
770 | } | |
771 | ||
772 | ret = sock_register(&rxrpc_family_ops); | |
773 | if (ret < 0) { | |
9b6d5398 | 774 | pr_crit("Cannot register socket family\n"); |
17926a79 DH |
775 | goto error_sock; |
776 | } | |
777 | ||
778 | ret = register_key_type(&key_type_rxrpc); | |
779 | if (ret < 0) { | |
9b6d5398 | 780 | pr_crit("Cannot register client key type\n"); |
17926a79 DH |
781 | goto error_key_type; |
782 | } | |
783 | ||
784 | ret = register_key_type(&key_type_rxrpc_s); | |
785 | if (ret < 0) { | |
9b6d5398 | 786 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
787 | goto error_key_type_s; |
788 | } | |
789 | ||
5873c083 DH |
790 | ret = rxrpc_sysctl_init(); |
791 | if (ret < 0) { | |
9b6d5398 | 792 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
793 | goto error_sysctls; |
794 | } | |
795 | ||
17926a79 | 796 | #ifdef CONFIG_PROC_FS |
d4beaa66 G |
797 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
798 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
799 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
800 | #endif |
801 | return 0; | |
802 | ||
5873c083 DH |
803 | error_sysctls: |
804 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
805 | error_key_type_s: |
806 | unregister_key_type(&key_type_rxrpc); | |
807 | error_key_type: | |
808 | sock_unregister(PF_RXRPC); | |
809 | error_sock: | |
810 | proto_unregister(&rxrpc_proto); | |
811 | error_proto: | |
651350d1 | 812 | destroy_workqueue(rxrpc_workqueue); |
648af7fc DH |
813 | error_security: |
814 | rxrpc_exit_security(); | |
651350d1 | 815 | error_work_queue: |
17926a79 DH |
816 | kmem_cache_destroy(rxrpc_call_jar); |
817 | error_call_jar: | |
818 | return ret; | |
819 | } | |
820 | ||
821 | /* | |
822 | * unregister the RxRPC protocol | |
823 | */ | |
824 | static void __exit af_rxrpc_exit(void) | |
825 | { | |
826 | _enter(""); | |
5873c083 | 827 | rxrpc_sysctl_exit(); |
17926a79 DH |
828 | unregister_key_type(&key_type_rxrpc_s); |
829 | unregister_key_type(&key_type_rxrpc); | |
830 | sock_unregister(PF_RXRPC); | |
831 | proto_unregister(&rxrpc_proto); | |
832 | rxrpc_destroy_all_calls(); | |
833 | rxrpc_destroy_all_connections(); | |
834 | rxrpc_destroy_all_transports(); | |
17926a79 DH |
835 | |
836 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); | |
837 | ||
4f95dd78 DH |
838 | /* We need to flush the scheduled work twice because the local endpoint |
839 | * records involve a work item in their destruction as they can only be | |
840 | * destroyed from process context. However, a connection may have a | |
841 | * work item outstanding - and this will pin the local endpoint record | |
842 | * until the connection goes away. | |
843 | * | |
844 | * Peers don't pin locals and calls pin sockets - which prevents the | |
845 | * module from being unloaded - so we should only need two flushes. | |
846 | */ | |
17926a79 | 847 | _debug("flush scheduled work"); |
651350d1 | 848 | flush_workqueue(rxrpc_workqueue); |
4f95dd78 DH |
849 | _debug("flush scheduled work 2"); |
850 | flush_workqueue(rxrpc_workqueue); | |
851 | _debug("synchronise RCU"); | |
852 | rcu_barrier(); | |
853 | _debug("destroy locals"); | |
4a3388c8 DH |
854 | ASSERT(idr_is_empty(&rxrpc_client_conn_ids)); |
855 | idr_destroy(&rxrpc_client_conn_ids); | |
4f95dd78 DH |
856 | rxrpc_destroy_all_locals(); |
857 | ||
ece31ffd G |
858 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
859 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 860 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 861 | rxrpc_exit_security(); |
17926a79 DH |
862 | kmem_cache_destroy(rxrpc_call_jar); |
863 | _leave(""); | |
864 | } | |
865 | ||
866 | module_init(af_rxrpc_init); | |
867 | module_exit(af_rxrpc_exit); |